?Uh-Oh? 
Be polite and leave. Don't argue, and don't admit to anything other than the fact you are a very lucky person. It is easy to avoid detection, but it is possible for anyone to be questioned about winning too often or too much. You are a guest in a private building and can be asked or forced to leave. Act confused and just leave. You can play again elsewhere and probably play where you were asked to leave after a little time has gone by.
Speaking of acting, you can learn to look and act like a losing player. Many players double their bets after a loss to try to break even or after they have won to get on a winning streak. You can do this too when you know the cards are right for it. A few words like "I feel lucky" or "I need to win that last bet back" can help cover for your actions. And never be too greedy. If you walk out of a casino with a few hundred dollars no one is really going to notice. Don't play at the same place all the time, and try to play at different tables as well. Tip the dealers and crew while you are at it. Sharing is always a good idea.